Ipv6 Neighbor Redirect Message - Cisco Nexus 7000 Series Configuration Manual

Information About IPv6
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .
RAs are also sent in response to router solicitation messages. Router solicitation messages, which have
a value of 133 in the Type field of the ICMP packet header, are sent by hosts at system startup so that
the host can immediately auto-configure without needing to wait for the next scheduled RA message.
The source address is usually the unspecified IPv6 address (0:0:0:0:0:0:0:0). If the host has a configured
unicast address, the unicast address of the interface that sends the router solicitation message is used as
the source address in the message. The destination address is the all-routers multicast address with a
scope of the link. When an RA is sent in response to a router solicitation, the destination address in the
RA message is the unicast address of the source of the router solicitation message.
You can configure the following RA message parameters:
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The configured parameters are specific to an interface. The sending of RA messages (with default
values) is automatically enabled on Ethernet interfaces. For other interface types, you must enter the no
ipv6 nd suppress-ra command to send RA messages. You can disable the RA message feature on
individual interfaces by entering the ipv6 nd suppress-ra command.

IPv6 Neighbor Redirect Message

Routers send neighbor redirect messages to inform hosts of better first-hop nodes on the path to a
destination (see

IPv6 neighbor redirect message.

Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
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The time interval between periodic RA messages
The router life-time value, which indicates the usefulness of a router as the default router (for use
by all nodes on a given link)
The network prefixes in use on a given link
The time interval between neighbor solicitation message retransmissions (on a given link)
The amount of time that a node considers a neighbor reachable (for use by all nodes on a given link)
Figure 3-14). A value of 137 in the Type field of the ICMP packet header identifies an
Chapter 3 Configuring IPv6
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